compare array data and get an merged output in php - php

Question

I have an array like this. I want remove elements with duplicate id and get sum of the count
array(3) {
[0]=>
array(3) {
["Id"]=>
string(1) "1"
["Name"]=>
string(1) "a"
["Count"]=>
string(1) "2"
}
[1]=>
array(3) {
["Id"]=>
string(1) "2"
["Name"]=>
string(1) "b"
["Count"]=>
string(1) "1"
}[2]=>
array(3) {
["Id"]=>
string(1) "1"
["Name"]=>
string(1) "a"
["Count"]=>
string(1) "1"
}
}
and I need to remove elements with duplicate id and get sum of the count as shown below
array(2) {
[0]=>
array(3) {
["Id"]=>
string(1) "1"
["Name"]=>
string(1) "a"
["Count"]=>
string(1) "3"
}[1]=>
array(3) {
["Id"]=>
string(1) "2"
["Name"]=>
string(1) "b"
["Count"]=>
string(1) "1"
}
}
I have gone through many examples.. but couldn't find an answer..

Answer 1

Unfortunately there is no way around looping. Assuming that Name is the same for the same Id or that you don't care about the value of Name:
foreach($array as $value) {
if(!isset($result[$value['Id']])) {
$result[$value['Id']] = $value;
} else {
$result[$value['Id']]['Count'] += $value['Count'];
}
}
// re-index if needed
$result = array_values($result);
Loop the array and build result array using Id as key
If the key Id doesn't exist create it
If it does exist add Count to the current Count

Answer 2

just create a new array, loop through current, create if doesnt exist, and insert values (sum) into new one
what are you doing with duplicates names?
example below. hope it will help.
<?php
$tArr = array(
array(
"Id" => "1",
"Name" => "a",
"Count" => "2",
),
array(
"Id" => "2",
"Name" => "b",
"Count" => "1",
),
array(
"Id" => "1",
"Name" => "a",
"Count" => "1",
)
);
$rez = array();
foreach ($tArr as $key => $element) {
if (empty($rez[$element["Id"]])) {
$rez[$element["Id"]] = $element;
} else {
$rez[$element["Id"]]["Count"] += $element["Count"];
}
}
var_dump($rez);
/** array (size=2)
1 =>
array (size=3)
'Id' => string '1' (length=1)
'Name' => string 'a' (length=1)
'Count' => int 3
2 =>
array (size=3)
'Id' => string '2' (length=1)
'Name' => string 'b' (length=1)
'Count' => string '1' (length=1)**/

Answer 3

Try this
$result = array_diff_assoc($arr, array_unique($arr));
print_r($result);